Can't get Quectel UC20 modem working on Embedded Board

[Brendan Simon (eTRIX)]

Hi,

Not sure if this the best forum to ask questions regarding MM
configuration, etc.  I hope so.  If not please refer me to appropriate
forums.

I have a Quectel UC20 gsm modem.  I got it working under Debian Jessie
on my MacBook (using VirtualBox).  It all seem to go well and had no
problems getting it to work (well, after I unloaded the option driver,
as the Quectel documentation only specifies the multiple tty method to
access the modem).

Now I have installed the same modem (on an evaluation board) to my
embedded arm board (Digilent ZedBoard with Xilinx Zynq dual ARM-A9 SOC),
also running Debian Jessie.  It's conncected via a USB OTG port.  It
shows up with lsusb and also the /dev/cdc-wdm0 entry is populated.  MM
can see the device with 'mmcli -L' and 'mmcli -m 0' reports a bunch of
information, so everything looks fine as far as detecting and
communicating with the device.

However, I just can't get it to connect to my ISP.  It works ok on the
full Debian Jessie system, but not on the ZedBoard.
I copied the /etc/NetworkManager/system-connections/<myisp> file from
the VB system.  I presume that is ok and MM should work.

I thought I would try creating a new connection, but I can't find a way
of doing this from the cli.  nm-connection-editor is gnome app and I
don't have gnome installed on my embedded board.  I tried nmtui,
nmtui-edit, nmtui-connect, but there are no options to add a Mobile
Broadband connection as there is with nm-connection-editor.

Is there a nice/easy way of adding a new Mobile Broadband connection
with the cli tools ?

    # cat /etc/NetworkManager/system-connections/Telstra\ Telstra\
    \(Next\ G\)\ 1
    [connection]
    id=Telstra Telstra (Next G) 1
    uuid=5ee505f2-e161-436b-9b00-b36cab43ebfc
    type=gsm

    [gsm]
    number=*99#
    password-flags=1
    apn=telstra.internet
    network-type=4

    [ipv6]
    method=auto

    [ipv4]
    method=auto

    [serial]
    baud=115200


    # lsmod
    Module                  Size  Used by
    cp210x                  7582  0
    qmi_wwan               10608  0
    cdc_wdm                 8788  2 qmi_wwan
    usbnet                 17174  1 qmi_wwan
    mii                     3417  1 usbnet
    ipv6                  262886  24


    # cat /boot/config-4.0.0-g0fa909f-dirty | grep -v '#' | grep
    'WWAN\|QMI\|USB_SERIAL\|PPP\|QUALCOM'
    CONFIG_NET_VENDOR_QUALCOMM=y
    CONFIG_PPP=m
    CONFIG_PPP_BSDCOMP=m
    CONFIG_PPP_DEFLATE=m
    CONFIG_PPP_FILTER=y
    CONFIG_PPP_MPPE=m
    CONFIG_PPP_MULTILINK=y
    CONFIG_PPPOE=m
    CONFIG_PPP_ASYNC=m
    CONFIG_PPP_SYNC_TTY=m
    CONFIG_USB_NET_QMI_WWAN=m
    CONFIG_USB_SERIAL=y
    CONFIG_USB_SERIAL_GENERIC=y
    CONFIG_USB_SERIAL_CP210X=m
    CONFIG_USB_SERIAL_FTDI_SIO=y
    CONFIG_USB_SERIAL_PL2303=m
    CONFIG_USB_SERIAL_QCAUX=m
    CONFIG_USB_SERIAL_QUALCOMM=m
    CONFIG_USB_SERIAL_WWAN=m
    CONFIG_USB_SERIAL_OPTION=m


Thanks, Brendan.

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